/Engine/Plugins/Editor/ContentBrowser/ContentBrowserAssetDataSource/Source/ContentBrowserAssetDataSource/Public/ContentBrowserAssetDataSource.h
Not all items or data sources will map to an physical path (eg, some may be purely virtualized views of data that doesn't exist on disk).
True if the physical path was found and the result filled, false otherwise.
virtual bool GetItemPhysicalPath ( const [FContentBrowserItemData](API\Editor\ContentBrowserData\FContentBrowserItemData) & InItem, [FString](API\Runtime\Core\Containers\FString) & OutDiskPath )